L3281 STMicroelectronics, L3281 Datasheet - Page 4

• Manufacturer Part Number: L3281
• Description: LOW VOLTAGE TELEPHONE SPEECH CIRCUITS
• Manufacturer: STMicroelectronics

L3281
ELECTRICAL CHARACTERISTICS I
T = 25 C; f = 1kHz; Unless Otherwise Specified
4/10
Symbol
THD
CMRR
THD
THD
THD
G
R
MU
MU
DG
DG
G
R
I
V
G
N
Z
G
N
Z
Z
V
leak
I
V
beep
beep
ro
ml
so
mf
ro
m
mf
tx
tx
rx
rx
z
l
beep
tx
rx
lo
hl
mf
tx
rx
Line Voltage
Common Mode Rej. Ratio
Sending Gain
Delta Sending Gain
Sending Distortion
Sending Noise
Mic. Input Impedance
Receiving Gain
Delta Receiving Gain
Receiving Distortion
Receiving Noise
Rec. Output Impedance
Sidetone
Line Match. Impedance
Sending Output Voltage
Receiving Output Current
Mute Input Low
Mute Input Open
DTMF Gain
DTMF Input Impedance
DTMF Distortion
Beeptone Gain
Beeptone Input Impedance
Beeptone Distortion
Zener Voltage (Pin 5)
Leakage Current,V
Parameter
pin5
= 3V
L
= 20 to 100mA; R4 =( 51
I
I
I
I
V
V
V
V
V
I
I
V
V
V
Load = 200 ; V
V
V
I
I
Dialing Mode
Speaking Mode
V
V
V
V
I
L
L
L
L
L
L
L
L
z
mi
mi
so
mi
mi
ro
ro
ri
mi
ri
mf IN
mf LN
beep IN
beep IN
= 1 mA
= 6.5mA
= 20mA
= 50mA
= 80mA
= 20mA; V
= 70mA; V
= 6.5mA; THD = 5%
= 6.5mA; THD = 5%
= 0V
= 0.2V
= 350mV; Load = 350
= 300mV; I
= 10mV; I
= 10mV; I
= 700mV; I
= 0V; I
= 10mV
= 10mV
= 10mV
= 140mV
Test Condition
= 25mV
= 100mV; I
L
= 50mA
ri
ri
L
L
= 0.2V
= 0.2V
L
L
= 20mA
= 70mA
ro
= 10 mA
= 20mA
= 50V
L
= 20mA
// diode) + 33 ;
– 10.7
– 7.2
– 7.2
Min.
14.5
500
100
0.5
5.5
4.2
50
30
40
5
– 9.2
– 5.7
Typ.
1.65
31.5
–5.7
– 70
100
600
3.4
6.0
8.5
0.5
5.1
10
10
50
16
10
20
8
8
Max.
– 7.7
– 4.2
–4.2
17.5
700
100
3.7
6.5
9.5
6.2
33
20
5
5
5
1
5
5
mAp
Unit
mV
dB
dB
dB
dB
k
dB
dB
dB
dB
k
dB
k
%
%
%
%
%
V
V
V
V
V
V
A
A
A